Public water system · CA3310049
ActiveWestern Mwd
At a glance
Western Mwd (PWSID CA3310049) is an active community water system in Riverside County, California. It reports serving 86,062 people through 22,297 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
86,062
Service connections
22,297
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Western Mwd compare with other water systems in Riverside County?
By EPA's size categories, Western Mwd is a large system (10,001 to 100,000 people). Riverside County has 197 active public water systems. Its population served is about 6 times the county average of 14,435 people per system, and accounts for 3% of the 2,843,721 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so Western Mwd is about 13 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 506 California systems (6.8%) list purchased surface water as their primary source.
Who owns and regulates Western Mwd?
EPA lists Western Mwd as owned by a local government. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 50 of the 197 active systems in Riverside County (25%) are also owned by a local government.
Does Western Mwd have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Western Mwd. For the latest compliance status, check EPA ECHO for current compliance history.
Western Mwd: frequently asked questions
Who runs Western Mwd?
Western Mwd (PWSID CA3310049) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Western Mwd serve?
Western Mwd reports serving 86,062 people through 22,297 service connections in Riverside County, California.
Where does Western Mwd get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Western Mwd have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Western Mwd's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Western Mwd's water quality report?
As a community water system, Western Mwd must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Riverside County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Eastern Municipal Wd | Riverside | 666,581 | Community | Purchased surface water |
| Riverside, City of | Riverside | 298,398 | Community | Groundwater under influence of surface water |
| Coachella Vwd: Cove Community | Riverside | 270,000 | Community | Groundwater |
| Elsinore Valley Mwd | Riverside | 169,455 | Community | Surface water |
| Corona, City of | Riverside | 168,575 | Community | Purchased surface water |
| Rancho California Water District | Riverside | 146,147 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Western Mwd, PWSID CA3310049, California”, https://aquacensus.com/water-systems/california/western-mwd-ca3310049 (data as of October 1, 2026).